How to stop the pump
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Dear everyone, for two centrifugal pumps operating in parallel, if one of them needs to be stopped, how should it be done in order to prevent water hammer from occurring in the other pump?
If there is a check valve at the outlet of each pump, it is sufficient to simply shut down the pump. If not, close the outlet valve and stop the pump; the valve should remain closed while the pump is running, but this period should not be too long.
There is a check valve at the outlet; when one pump is stopped, the other pump produces a loud water hammer sound
Slowly close the outlet valve of the pump that needs to be stopped, and then shut down the pump.
Slowly close the outlet valve and listen to the motor
A check valve is installed on the pump outlet pipe. Additionally, the water pump can be equipped with an inverter to operate at a low frequency before shutdown, resulting in less impact during switching